1. Arizona Cardinals

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The Arizona Cardinals are an impressive 4-2 this season. They have won games because their defense is among the best in football, causing turnovers at will and creating tremendous amounts of pressure on opposing offenses.

The problem with Arizona is that it has a lackluster "game manager" at QB in the form of Kevin Kolb.

Kolb is not terrible, but he is average at best. Manning is a known elite commodity and could immediately elevate the Cardinals to the top of the NFL.

The Cardinals are close as they stand now—their defense is simply that good—but with Manning at the helm they would become bona fide Super Bowl contenders.